Siderite belongs to the calcite group of minerals, a group of related Limonite, an amorphous mineral, is commonly found in rhombohedral crystals, as it Composition, Iron carbonate, usually containing some magnesium and calcium,

Siderite is a mineral composed of ironII carbonate FeCO3. It takes its name from the Greek Although spathic carbonate iron ores, such as siderite, have been economically important for steel Jump up ^ Some siderite, along with goethite, also forms in bog iron deposits, but these are small and economically minor.

Currently used for unidentified massive hydroxides and oxides of iron, with no visible hisingerite , pitticite , jarosite group species, maghemite , hematite , etc. Any "crystals" of "limonite" are actually pseudomorphs of other minerals which

siderite definition: 1. a yellowish to brownish, semihard mineral, iron siderite. noun. An ore of iron, FeCO3. A meteorite consisting mainly of iron and nickel. They are four important iron ores, magnetite, haematite, limonite and siderite, and